What was found
COLONY SERVICES, FAR PART 137 OPERATOR REPORTED AFTER INSTALLATION OF NEW TAIL ROTOR BLADES, SEVERE VIBRATION OCCURRED DURING FLIGHT. BLADE S/N A0011 HAD AN UNUSUAL SWELLING AT THE BLADE TIP, END OF THE EROSION GUARD. THREE-QUARTERS OF THE BLADE HAD BLADE SEPARATION. WHEN THE BLADE WAS REMOVED THE WHOLE BLADE WAS SWOLLEN. THE BLADES HAD LESS THAN 1 HOUR TOTAL TIME WHEN THEY WERE REMOVED.